Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (3): 138-151.doi: 10.12108/yxyqc.20230312

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Characteristics and main controlling factors of natural gas of CarboniferousPermian in western well Pen-1 sag，Junggar Basin

JIANG Mengya, WANG Jiangtao, LIU Longsong, LI Hui, CHEN Hailong, JIANG Zhongfa, WANG Xueyong, LIU Hailei   

  1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2022-08-03 Revised:2022-09-13 Online:2023-05-01 Published:2023-04-25

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Abstract: Based on the seismic， drilling， logging， core， thin section and organic geochemical data， the geochemical characteristics，genesis，sources，main controlling factors of gas reservoir accumulation and exploration potential of natural gas of Carboniferous-Permian in western well Pen-1 sag of Junggar Basin were studied. The result shows that： （1）The volume fraction of methane in deep Carboniferous-Permian natural gas in western well Pen- 1 sag is 70.93%-96.55%，with an average of 81.78%，which is generally wet gas. The carbon isotope distribution is relatively wide. The carbon isotope value of methane ranges from -41.62‰ to -30.42‰，with an average value of -34.75‰，and most of them are in mature to high mature stage. The carbon isotope value of ethane ranges from -31.69‰ to -24.16‰，with an average value of -27.50‰，which means that coal type gas is the main origin of natural gas，followed by mixed origin gas. The relative contents of methylcyclohexane and n-heptane in C7 light hydrocarbon compounds are large，the relative mass fraction of methylcyclohexane is 32.14%-58.37%， with an average of 38.84%，and the relative mass fraction of n-heptane is 25.37%-56.56%，with an average of 47.79%.（2）The natural gas in the study area has complex origin and sources，the coal-type gas from the source rocks of lower Urho Formation and its mixture with oil-type gas of Fengcheng Formation are absolutely dominant，while the oil-type gas from the source rocks of Fengcheng Formation is less.（3）The source rocks of Permian Fengcheng Formation and lower Urho Formation in the study area have great gas generation potential，and multiple lithologic reservoirs are developed. Faults and unconformity permeable sand bodies constitute a transport system for deep gas migration and accumulation. Carboniferous paleo convex and Permian lithologic trap are complementary，which plays a good role of lateral shielding for the accumulation of natural gas in the slope area.（4）Carboniferous volcanic rocks in nose-bulge and clastic rocks of Permian Fengcheng Formation in sags in the study area are potential favorable areas for deep natural gas exploration in western well Pen-1 sag.

Key words: wet gas, volcanic rock, clastic rock, coal-type gas of lower Urho Formation, oil-type gas of Fengcheng Formation, Carboniferous-Permian, western well Pen-1 sag, Junggar Basin

CLC Number: 

  • TE122
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